Protect strdup/memcmp from macro subsitution. Let compiler pick registers.

libraries/liblutil/memcmp.c

@@ -6,10 +6,10 @@
  * Memory Compare
  */
 int
-memcmp(const void *v1, const void *v2, int n) 
+(memcmp)(const void *v1, const void *v2, int n) 
 {
     if (n != 0) {
-		register const unsigned char *s1=v1, *s2=v2;
+		const unsigned char *s1=v1, *s2=v2;
         do {
             if (*s1++ != *s2++)
                 return (*--s1 - *--s2);

libraries/liblutil/strdup.c

@@ -6,7 +6,7 @@
 #include <ac/string.h>
 #include "lutil.h"
 
-char *strdup( const char *s )
+char *(strdup)( const char *s )
 {
         char    *p;